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1#ifndef _LINUX_GENHD_H
2#define _LINUX_GENHD_H
3
4/*
5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
7 * Drew Eckhardt
8 *
9 * <drew@colorado.edu>
10 */
11
12#include <linux/types.h>
13#include <linux/kdev_t.h>
14
15#ifdef CONFIG_BLOCK
16
17#define kobj_to_dev(k) container_of(k, struct device, kobj)
18#define dev_to_disk(device) container_of(device, struct gendisk, dev)
19#define dev_to_part(device) container_of(device, struct hd_struct, dev)
20
21extern struct device_type part_type;
22extern struct kobject *block_depr;
23extern struct class block_class;
24
25extern const struct seq_operations partitions_op;
26extern const struct seq_operations diskstats_op;
27
28enum {
29/* These three have identical behaviour; use the second one if DOS FDISK gets
30 confused about extended/logical partitions starting past cylinder 1023. */
31 DOS_EXTENDED_PARTITION = 5,
32 LINUX_EXTENDED_PARTITION = 0x85,
33 WIN98_EXTENDED_PARTITION = 0x0f,
34
35 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36
37 LINUX_SWAP_PARTITION = 0x82,
38 LINUX_DATA_PARTITION = 0x83,
39 LINUX_LVM_PARTITION = 0x8e,
40 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
41
42 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 NEW_SOLARIS_X86_PARTITION = 0xbf,
44
45 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
46 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
47 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
48 EZD_PARTITION = 0x55, /* EZ-DRIVE */
49
50 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
51 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
52 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
53 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
54 MINIX_PARTITION = 0x81, /* Minix Partition ID */
55 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
56};
57
58#include <linux/major.h>
59#include <linux/device.h>
60#include <linux/smp.h>
61#include <linux/string.h>
62#include <linux/fs.h>
63#include <linux/workqueue.h>
64
65struct partition {
66 unsigned char boot_ind; /* 0x80 - active */
67 unsigned char head; /* starting head */
68 unsigned char sector; /* starting sector */
69 unsigned char cyl; /* starting cylinder */
70 unsigned char sys_ind; /* What partition type */
71 unsigned char end_head; /* end head */
72 unsigned char end_sector; /* end sector */
73 unsigned char end_cyl; /* end cylinder */
74 __le32 start_sect; /* starting sector counting from 0 */
75 __le32 nr_sects; /* nr of sectors in partition */
76} __attribute__((packed));
77
78struct disk_stats {
79 unsigned long sectors[2]; /* READs and WRITEs */
80 unsigned long ios[2];
81 unsigned long merges[2];
82 unsigned long ticks[2];
83 unsigned long io_ticks;
84 unsigned long time_in_queue;
85};
86
87struct hd_struct {
88 sector_t start_sect;
89 sector_t nr_sects;
90 struct device dev;
91 struct kobject *holder_dir;
92 int policy, partno;
93#ifdef CONFIG_FAIL_MAKE_REQUEST
94 int make_it_fail;
95#endif
96 unsigned long stamp;
97 int in_flight;
98#ifdef CONFIG_SMP
99 struct disk_stats *dkstats;
100#else
101 struct disk_stats dkstats;
102#endif
103};
104
105#define GENHD_FL_REMOVABLE 1
106#define GENHD_FL_DRIVERFS 2
107#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
108#define GENHD_FL_CD 8
109#define GENHD_FL_UP 16
110#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
111#define GENHD_FL_FAIL 64
112
113
114struct gendisk {
115 int major; /* major number of driver */
116 int first_minor;
117 int minors; /* maximum number of minors, =1 for
118 * disks that can't be partitioned. */
119 char disk_name[32]; /* name of major driver */
120 struct hd_struct **part; /* [indexed by minor] */
121 struct block_device_operations *fops;
122 struct request_queue *queue;
123 void *private_data;
124 sector_t capacity;
125
126 int flags;
127 struct device *driverfs_dev; // FIXME: remove
128 struct device dev;
129 struct kobject *holder_dir;
130 struct kobject *slave_dir;
131
132 struct timer_rand_state *random;
133 int policy;
134
135 atomic_t sync_io; /* RAID */
136 unsigned long stamp;
137 int in_flight;
138#ifdef CONFIG_SMP
139 struct disk_stats *dkstats;
140#else
141 struct disk_stats dkstats;
142#endif
143 struct work_struct async_notify;
144};
145
146/*
147 * Macros to operate on percpu disk statistics:
148 *
149 * The __ variants should only be called in critical sections. The full
150 * variants disable/enable preemption.
151 */
152static inline struct hd_struct *get_part(struct gendisk *gendiskp,
153 sector_t sector)
154{
155 struct hd_struct *part;
156 int i;
157 for (i = 0; i < gendiskp->minors - 1; i++) {
158 part = gendiskp->part[i];
159 if (part && part->start_sect <= sector
160 && sector < part->start_sect + part->nr_sects)
161 return part;
162 }
163 return NULL;
164}
165
166#ifdef CONFIG_SMP
167#define __disk_stat_add(gendiskp, field, addnd) \
168 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
169
170#define disk_stat_read(gendiskp, field) \
171({ \
172 typeof(gendiskp->dkstats->field) res = 0; \
173 int i; \
174 for_each_possible_cpu(i) \
175 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
176 res; \
177})
178
179static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
180 int i;
181
182 for_each_possible_cpu(i)
183 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
184 sizeof(struct disk_stats));
185}
186
187#define __part_stat_add(part, field, addnd) \
188 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
189
190#define __all_stat_add(gendiskp, part, field, addnd, sector) \
191({ \
192 if (part) \
193 __part_stat_add(part, field, addnd); \
194 __disk_stat_add(gendiskp, field, addnd); \
195})
196
197#define part_stat_read(part, field) \
198({ \
199 typeof(part->dkstats->field) res = 0; \
200 int i; \
201 for_each_possible_cpu(i) \
202 res += per_cpu_ptr(part->dkstats, i)->field; \
203 res; \
204})
205
206static inline void part_stat_set_all(struct hd_struct *part, int value)
207{
208 int i;
209
210 for_each_possible_cpu(i)
211 memset(per_cpu_ptr(part->dkstats, i), value,
212 sizeof(struct disk_stats));
213}
214
215#else /* !CONFIG_SMP */
216#define __disk_stat_add(gendiskp, field, addnd) \
217 (gendiskp->dkstats.field += addnd)
218#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
219
220static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
221{
222 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
223}
224
225#define __part_stat_add(part, field, addnd) \
226 (part->dkstats.field += addnd)
227
228#define __all_stat_add(gendiskp, part, field, addnd, sector) \
229({ \
230 if (part) \
231 part->dkstats.field += addnd; \
232 __disk_stat_add(gendiskp, field, addnd); \
233})
234
235#define part_stat_read(part, field) (part->dkstats.field)
236
237static inline void part_stat_set_all(struct hd_struct *part, int value)
238{
239 memset(&part->dkstats, value, sizeof(struct disk_stats));
240}
241
242#endif /* CONFIG_SMP */
243
244#define disk_stat_add(gendiskp, field, addnd) \
245 do { \
246 preempt_disable(); \
247 __disk_stat_add(gendiskp, field, addnd); \
248 preempt_enable(); \
249 } while (0)
250
251#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
252#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
253
254#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
255#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
256
257#define __disk_stat_sub(gendiskp, field, subnd) \
258 __disk_stat_add(gendiskp, field, -subnd)
259#define disk_stat_sub(gendiskp, field, subnd) \
260 disk_stat_add(gendiskp, field, -subnd)
261
262#define part_stat_add(gendiskp, field, addnd) \
263 do { \
264 preempt_disable(); \
265 __part_stat_add(gendiskp, field, addnd);\
266 preempt_enable(); \
267 } while (0)
268
269#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
270#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
271
272#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
273#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
274
275#define __part_stat_sub(gendiskp, field, subnd) \
276 __part_stat_add(gendiskp, field, -subnd)
277#define part_stat_sub(gendiskp, field, subnd) \
278 part_stat_add(gendiskp, field, -subnd)
279
280#define all_stat_add(gendiskp, part, field, addnd, sector) \
281 do { \
282 preempt_disable(); \
283 __all_stat_add(gendiskp, part, field, addnd, sector); \
284 preempt_enable(); \
285 } while (0)
286
287#define __all_stat_dec(gendiskp, field, sector) \
288 __all_stat_add(gendiskp, field, -1, sector)
289#define all_stat_dec(gendiskp, field, sector) \
290 all_stat_add(gendiskp, field, -1, sector)
291
292#define __all_stat_inc(gendiskp, part, field, sector) \
293 __all_stat_add(gendiskp, part, field, 1, sector)
294#define all_stat_inc(gendiskp, part, field, sector) \
295 all_stat_add(gendiskp, part, field, 1, sector)
296
297#define __all_stat_sub(gendiskp, part, field, subnd, sector) \
298 __all_stat_add(gendiskp, part, field, -subnd, sector)
299#define all_stat_sub(gendiskp, part, field, subnd, sector) \
300 all_stat_add(gendiskp, part, field, -subnd, sector)
301
302/* Inlines to alloc and free disk stats in struct gendisk */
303#ifdef CONFIG_SMP
304static inline int init_disk_stats(struct gendisk *disk)
305{
306 disk->dkstats = alloc_percpu(struct disk_stats);
307 if (!disk->dkstats)
308 return 0;
309 return 1;
310}
311
312static inline void free_disk_stats(struct gendisk *disk)
313{
314 free_percpu(disk->dkstats);
315}
316
317static inline int init_part_stats(struct hd_struct *part)
318{
319 part->dkstats = alloc_percpu(struct disk_stats);
320 if (!part->dkstats)
321 return 0;
322 return 1;
323}
324
325static inline void free_part_stats(struct hd_struct *part)
326{
327 free_percpu(part->dkstats);
328}
329
330#else /* CONFIG_SMP */
331static inline int init_disk_stats(struct gendisk *disk)
332{
333 return 1;
334}
335
336static inline void free_disk_stats(struct gendisk *disk)
337{
338}
339
340static inline int init_part_stats(struct hd_struct *part)
341{
342 return 1;
343}
344
345static inline void free_part_stats(struct hd_struct *part)
346{
347}
348#endif /* CONFIG_SMP */
349
350/* drivers/block/ll_rw_blk.c */
351extern void disk_round_stats(struct gendisk *disk);
352extern void part_round_stats(struct hd_struct *part);
353
354/* drivers/block/genhd.c */
355extern int get_blkdev_list(char *, int);
356extern void add_disk(struct gendisk *disk);
357extern void del_gendisk(struct gendisk *gp);
358extern void unlink_gendisk(struct gendisk *gp);
359extern struct gendisk *get_gendisk(dev_t dev, int *part);
360
361extern void set_device_ro(struct block_device *bdev, int flag);
362extern void set_disk_ro(struct gendisk *disk, int flag);
363
364/* drivers/char/random.c */
365extern void add_disk_randomness(struct gendisk *disk);
366extern void rand_initialize_disk(struct gendisk *disk);
367
368static inline sector_t get_start_sect(struct block_device *bdev)
369{
370 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
371}
372static inline sector_t get_capacity(struct gendisk *disk)
373{
374 return disk->capacity;
375}
376static inline void set_capacity(struct gendisk *disk, sector_t size)
377{
378 disk->capacity = size;
379}
380
381#ifdef CONFIG_SOLARIS_X86_PARTITION
382
383#define SOLARIS_X86_NUMSLICE 16
384#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
385
386struct solaris_x86_slice {
387 __le16 s_tag; /* ID tag of partition */
388 __le16 s_flag; /* permission flags */
389 __le32 s_start; /* start sector no of partition */
390 __le32 s_size; /* # of blocks in partition */
391};
392
393struct solaris_x86_vtoc {
394 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
395 __le32 v_sanity; /* to verify vtoc sanity */
396 __le32 v_version; /* layout version */
397 char v_volume[8]; /* volume name */
398 __le16 v_sectorsz; /* sector size in bytes */
399 __le16 v_nparts; /* number of partitions */
400 unsigned int v_reserved[10]; /* free space */
401 struct solaris_x86_slice
402 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
403 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
404 char v_asciilabel[128]; /* for compatibility */
405};
406
407#endif /* CONFIG_SOLARIS_X86_PARTITION */
408
409#ifdef CONFIG_BSD_DISKLABEL
410/*
411 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
412 * updated by Marc Espie <Marc.Espie@openbsd.org>
413 */
414
415/* check against BSD src/sys/sys/disklabel.h for consistency */
416
417#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
418#define BSD_MAXPARTITIONS 16
419#define OPENBSD_MAXPARTITIONS 16
420#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
421struct bsd_disklabel {
422 __le32 d_magic; /* the magic number */
423 __s16 d_type; /* drive type */
424 __s16 d_subtype; /* controller/d_type specific */
425 char d_typename[16]; /* type name, e.g. "eagle" */
426 char d_packname[16]; /* pack identifier */
427 __u32 d_secsize; /* # of bytes per sector */
428 __u32 d_nsectors; /* # of data sectors per track */
429 __u32 d_ntracks; /* # of tracks per cylinder */
430 __u32 d_ncylinders; /* # of data cylinders per unit */
431 __u32 d_secpercyl; /* # of data sectors per cylinder */
432 __u32 d_secperunit; /* # of data sectors per unit */
433 __u16 d_sparespertrack; /* # of spare sectors per track */
434 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
435 __u32 d_acylinders; /* # of alt. cylinders per unit */
436 __u16 d_rpm; /* rotational speed */
437 __u16 d_interleave; /* hardware sector interleave */
438 __u16 d_trackskew; /* sector 0 skew, per track */
439 __u16 d_cylskew; /* sector 0 skew, per cylinder */
440 __u32 d_headswitch; /* head switch time, usec */
441 __u32 d_trkseek; /* track-to-track seek, usec */
442 __u32 d_flags; /* generic flags */
443#define NDDATA 5
444 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
445#define NSPARE 5
446 __u32 d_spare[NSPARE]; /* reserved for future use */
447 __le32 d_magic2; /* the magic number (again) */
448 __le16 d_checksum; /* xor of data incl. partitions */
449
450 /* filesystem and partition information: */
451 __le16 d_npartitions; /* number of partitions in following */
452 __le32 d_bbsize; /* size of boot area at sn0, bytes */
453 __le32 d_sbsize; /* max size of fs superblock, bytes */
454 struct bsd_partition { /* the partition table */
455 __le32 p_size; /* number of sectors in partition */
456 __le32 p_offset; /* starting sector */
457 __le32 p_fsize; /* filesystem basic fragment size */
458 __u8 p_fstype; /* filesystem type, see below */
459 __u8 p_frag; /* filesystem fragments per block */
460 __le16 p_cpg; /* filesystem cylinders per group */
461 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
462};
463
464#endif /* CONFIG_BSD_DISKLABEL */
465
466#ifdef CONFIG_UNIXWARE_DISKLABEL
467/*
468 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
469 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
470 */
471
472#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
473#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
474#define UNIXWARE_NUMSLICE 16
475#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
476
477struct unixware_slice {
478 __le16 s_label; /* label */
479 __le16 s_flags; /* permission flags */
480 __le32 start_sect; /* starting sector */
481 __le32 nr_sects; /* number of sectors in slice */
482};
483
484struct unixware_disklabel {
485 __le32 d_type; /* drive type */
486 __le32 d_magic; /* the magic number */
487 __le32 d_version; /* version number */
488 char d_serial[12]; /* serial number of the device */
489 __le32 d_ncylinders; /* # of data cylinders per device */
490 __le32 d_ntracks; /* # of tracks per cylinder */
491 __le32 d_nsectors; /* # of data sectors per track */
492 __le32 d_secsize; /* # of bytes per sector */
493 __le32 d_part_start; /* # of first sector of this partition */
494 __le32 d_unknown1[12]; /* ? */
495 __le32 d_alt_tbl; /* byte offset of alternate table */
496 __le32 d_alt_len; /* byte length of alternate table */
497 __le32 d_phys_cyl; /* # of physical cylinders per device */
498 __le32 d_phys_trk; /* # of physical tracks per cylinder */
499 __le32 d_phys_sec; /* # of physical sectors per track */
500 __le32 d_phys_bytes; /* # of physical bytes per sector */
501 __le32 d_unknown2; /* ? */
502 __le32 d_unknown3; /* ? */
503 __le32 d_pad[8]; /* pad */
504
505 struct unixware_vtoc {
506 __le32 v_magic; /* the magic number */
507 __le32 v_version; /* version number */
508 char v_name[8]; /* volume name */
509 __le16 v_nslices; /* # of slices */
510 __le16 v_unknown1; /* ? */
511 __le32 v_reserved[10]; /* reserved */
512 struct unixware_slice
513 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
514 } vtoc;
515
516}; /* 408 */
517
518#endif /* CONFIG_UNIXWARE_DISKLABEL */
519
520#ifdef CONFIG_MINIX_SUBPARTITION
521# define MINIX_NR_SUBPARTITIONS 4
522#endif /* CONFIG_MINIX_SUBPARTITION */
523
524#define ADDPART_FLAG_NONE 0
525#define ADDPART_FLAG_RAID 1
526#define ADDPART_FLAG_WHOLEDISK 2
527
528extern dev_t blk_lookup_devt(const char *name, int part);
529extern char *disk_name (struct gendisk *hd, int part, char *buf);
530
531extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
532extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
533extern void delete_partition(struct gendisk *, int);
534extern void printk_all_partitions(void);
535
536extern struct gendisk *alloc_disk_node(int minors, int node_id);
537extern struct gendisk *alloc_disk(int minors);
538extern struct kobject *get_disk(struct gendisk *disk);
539extern void put_disk(struct gendisk *disk);
540extern void blk_register_region(dev_t devt, unsigned long range,
541 struct module *module,
542 struct kobject *(*probe)(dev_t, int *, void *),
543 int (*lock)(dev_t, void *),
544 void *data);
545extern void blk_unregister_region(dev_t devt, unsigned long range);
546
547static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
548{
549 return bdget(MKDEV(disk->major, disk->first_minor) + index);
550}
551
552#else /* CONFIG_BLOCK */
553
554static inline void printk_all_partitions(void) { }
555
556static inline dev_t blk_lookup_devt(const char *name, int part)
557{
558 dev_t devt = MKDEV(0, 0);
559 return devt;
560}
561
562#endif /* CONFIG_BLOCK */
563
564#endif /* _LINUX_GENHD_H */